My fiancee/daughters father cheated on me when he was out with a new male coworker he's been hanging out with?

I know that his friend has a girlfriend and they live across the street. I saw the friend and my fiancee getting into a car with two women and that day my fiancee was gone til 12pm the next day... Would you tell the friends girlfriend? Would it be out of line? Should I just leave it alone and let her find out herself that he's cheating on her? The guy is a real scumbag and even tried getting at me.
My fiancee/daughters father cheated on me when he was out with a new male coworker he's been hanging out with?
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